Sooner or later we have to give one of our centre-backs a chance. Vidic was poor in his season. Centre-back like goal keeper is a position which relies on communication and organisation so new players come in and often struggle, and it's even more difficult at City because we can't really afford to allow a player time to settle in on the job so they are in out in out.
I thought last season that our defending against teams on the counter-attack was the weakest part of our play. We'd dominate games, besiege the opponents box, and then they'd counter-attack and slice straight through us. In fact Bravo's poor stats possibly came down to the very clear cut opportunities our opponents got.
This season our central defence should be stronger because they are protected by quick full backs, and they have a solid keeper behind them (I hope), but still we don't have much cover in front. Toure played quite a lot last season and is good on the ball, but useless when we lose the ball. This part of our game i still a risk. We have no defensive midfield.
Kompany starts the season fit. That is obviously an advantage too, but I can't see him playing 60 games. That means Stones and Otamendi have to play together at some point. Last season I thought those two were very poor without Kompany, but I really rate Stones. I think there's a strong argument for a squad player who will allow Stones to develop rather than buy VVD and push Stones down a rung. Stones if he starts doing the basics of defending better can become a really top class defender.
So in brief, central defence is a top priority, but the solution maybe not be to spend £60m and go back to square 1 again.